The time needed for a radioactive sample to decay to one-half of its original activity is called the

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

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with this one i know the answer in craters one reason i looked it up and i learned about it there is my evidence